In a year, no more physical police verification for passports: Home Secy

London, May 20: The current physical distancing guidelines of 6 feet may be insufficient to prevent COVID-19 transmission, according to a study which says a mild cough in low wind speeds can propel saliva droplets by as much as 18 feet.

Researchers, including those from the University of Nicosia in Cyprus, said a good baseline for studying the airborne transmission of viruses, like the one behind the COVID-19 pandemic, is a deeper understanding of how particles travel through the air when people cough.

In the study, published in the journal Physics of Fluids, they said even with a slight breeze of about four kilometres per hour (kph), saliva travels 18 feet in 5 seconds.

"The droplet cloud will affect both adults and children of different heights," said study co-author Dimitris Drikakis from the University of Nicosia.

According to the scientists, shorter adults and children could be at higher risk if they are located within the trajectory of the saliva droplets.

They said saliva is a complex fluid, which travels suspended in a bulk of surrounding air released by a cough, adding that many factors affect how saliva droplets travel in the air.

These factors, the study noted, include the size and number of droplets, how they interact with one another and the surrounding air as they disperse and evaporate, how heat and mass are transferred, and the humidity and temperature of the surrounding air.

In the study, the scientists created a computer simulation to examine the state of every saliva droplet moving through the air in front of a coughing person.

The model considered the effects of humidity, dispersion force, interactions of molecules of saliva and air, and how the droplets change from liquid to vapour and evaporate, along with a grid representing the space in front of a coughing person.

Each grid, the scientists said, holds information about variables like pressure, fluid velocity, temperature, droplet mass, and droplet position.

The study analysed the fates of nearly 1,008 simulated saliva droplets, and solved as many as 3.7 million equations.

"The purpose of the mathematical modelling and simulation is to take into account all the real coupling or interaction mechanisms that may take place between the main bulk fluid flow and the saliva droplets, and between the saliva droplets themselves," explained Talib Dbouk, another co-author of the study.

However, the researchers added that further studies are needed to determine the effect of ground surface temperature on the behaviour of saliva in air.

They also believe that indoor environments, especially ones with air conditioning, may significantly affect the particle movement through air.

This work is important since it concerns safety distance guidelines, and advances the understanding of the transmission of airborne diseases, Drikakis said.

Bengaluru, Jul 6: Karnataka government has revised quarantine norms according to which those entering the State from other states, including from Maharashtra, shall be placed in 14-days home quarantine.

Until now, the state government had issued that those returning from Maharashtra are to be placed under 7-day institutional quarantine followed by 7-day home quarantine.

A fresh state government order with the subject line "Regulation of movement of persons from other States to Karnataka" reads: "Whereas the State Government vide Order dated June 30, issued unlock 2 guidelines which permit reopening of more activities in a calibrated manner, in areas outside the Containment Zones, and to extend lockdown in Containment Zone upto July 31. The guidelines also permit unrestricted interstate movement of persons and goods adhering to the SOPs/ Guidelines issued by the Department of Health and Family Welfare and Department of Revenue (Disaster Management)".

Whereas, the Department of Health and Family Welfare issued revised SOP for the moment of persons from other State to Karnataka vide document dated June 8, this year, further, quarantine norms were modified vide Orders of even number dated June 15 and June 26.

"The quarantine norms are regularly reviewed and calibrated with the prevailing Unlock 2 guidelines and infusion of technology and community involvement to enforce the strict home quarantine. In light of the above, the quarantine norms issued vide Order dated June 26, has been further modified and is follows--Persons coming from other State to Karnataka, including Maharashtra shall be placed in 14-days Home Quarantine," the order read.

"The other conditions as specified in the Order dated June 15 and aforementioned SOP enclosed issued on June 8 by the Department of Health and Family Welfare shall continue to be in force until further orders," it added.

Bhopal, Mar 11: After meeting with 19 party MLAs who have tendered their resignations, Congress leader Sajjan Singh Verma on Wednesday said they are neither willing to support Jyotiraditya Scindia nor in favour of joining BJP as they were "misled and taken to Bengaluru" in Karnataka.

"Nobody is ready to go with Scindia ji. They said they were misled and taken to Bengaluru, most of them said they are not ready to join BJP," Verma told media persons on being asked about the 19 MLAs.

"I just came from Bengaluru and now I am going to Jaipur. Besides 5-6 ministers and one MLA, we all are going to Jaipur. They (MLAs) have said they have the blood of Congress and they will remain in the party. 
Since Scindia was a senior party leader, all our MLAs followed his order as a courtesy," he said.

The Congress leader further claimed that BJP is using both "muscle and money power" to influence Congress MLAs.

He also claimed that he is strongly in contact with 7-8 BJP MLAs.

On Tuesday, Congress sent two of its leaders -- Verma and Govind Singh -- to Bengaluru in order to pacify some of the rebel MLAs who are lodged in a hotel there and who claimed to have resigned from the state Legislative Assembly.

Most of the rebel MLAs are perceived close to Scindia and are apparently unhappy at Scindia being "ignored" in the party. The grand old party has been witnessing an internal turf war in Madhya Pradesh since the party formed the government in the state in 2018.

Scindia is likely to join BJP later today.